Document Type: Original Article
Faculty of Electrical Engineering, Shahid Beheshti University, A.C., Tehran, Iran. 1658953571.
1Faculty of Electrical Engineering, Shahid Beheshti University, A.C., Tehran, Iran. 1658953571.
Fuel cell energy systems can deliver green energy efficiently without CO2 emissions which are nominated as a substitution choice for the conventional power sources. This paper proposes a new high step-up DC-DC converter which is applicable in distributed energy resources, especially for fuel cell power conditioning systems. The converter contains a bidirectional boost cell with a coupled inductor, two transformers whose secondary sides are connected in series to increase the voltage gain and also a voltage doubler. Leakage inductance of coupled inductor limits the currents of output diodes and results in Zero Current Switching (ZCS) of the diodes. The converter schematic is presented at first and then its analysis results in different modes of operation are given. After that the theoretical formulation of voltage gain are achieved and proved. Finally, simulations results for a 400 W/ 380 V load are presented to validate the claimed characteristics of the proposed converter.